Do you use <object> functionality in your web application? Do you support Microsoft Internet Explorer?
If so, you might want to take a look at this: Microsoft’s Active X D-Day, which details Microsoft’s plans to change IE to deal with the Eolas lawsuit. Apparently the update won’t be critical, but eventually will be rolled into every version of IE.
Here’s a bit more technical explanation of what how to fix object embedding from Microsoft, and a bit of history from 2003.